Advance Tkts Needed for Provence Museums in June?

Hello.
With the big Aix Cezanne exhibit opening in late June, are advance tickets to the art museums/sites in Avignon, St. Remy, Arles, and Aix suggested? Unfortunately, we'll miss the opening by a week or so, but wonder about expected art-loving visitors and long lines to enter this and other museums in early-mid June.
Thanks for any thoughts on this.
Lee